{"id":1815,"date":"2026-02-14T04:27:48","date_gmt":"2026-02-14T04:27:48","guid":{"rendered":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/chapter\/ch085-xhtml\/"},"modified":"2026-08-01T10:07:53","modified_gmt":"2026-08-01T10:07:53","slug":"exercise-5","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/chapter\/exercise-5\/","title":{"raw":"Exercise 5","rendered":"Exercise 5"},"content":{"raw":"
\r\n
\r\n
\r\n\r\nA production well was designed to yield 2,000 m3<\/sup>\/d from a 40 m thick confined gravel\u2011rich aquifer. The well was 40 cm in diameter and screened over 35 m. Once the well was completed, a step test was conducted by pumping the well at 1,400 m3<\/sup>\/d, 1,790 m3<\/sup>\/d and then 2,520 m3<\/sup>\/d for a total of 90 minutes with each step lasting 30 min. The time\u2011drawdown data and a semi\u2011log plot of the time\u2011drawdown data are presented here.\r\n\r\n<\/div>\r\n
\r\n\r\n\"\"\r\n\r\n<\/div>\r\n
\r\n
Step\u2011drawdown test data for a production well. a) Time\u2011drawdown data for three steps. b) Plot of the log of time versus drawdown.<\/blockquote>\r\n<\/div>\r\n
\r\n
An Excel\u00ae data base of the time\u2011drawdown data is available on the web page for this book<\/a>\u2197.<\/blockquote>\r\n<\/div>\r\n
    \r\n \t
  1. Calculate the value of C<\/em> and B<\/em> for this system. Compute the well loss expected when pumping the well at 2,000 m3<\/sup>\/d.<\/li>\r\n \t
  2. Estimate the total drawdown after pumping the well for 30 min at 2,000 m3<\/sup>\/d.<\/li>\r\n \t
  3. Estimate transmissivity using the first 30 minutes of time\u2011drawdown data (step 1) (use the Cooper\u2011Jacob method).<\/li>\r\n<\/ol>\r\n
    \r\n
    Solution to Exercise\u00a05<\/a><\/blockquote>\r\n<\/div>\r\n
    \r\n
    Return to where text linked to Exercise\u00a05<\/a><\/blockquote>\r\n<\/div>\r\n<\/div>\r\n
    <\/div>\r\n<\/div>","rendered":"
    \n
    \n
    \n

    A production well was designed to yield 2,000 m3<\/sup>\/d from a 40 m thick confined gravel\u2011rich aquifer. The well was 40 cm in diameter and screened over 35 m. Once the well was completed, a step test was conducted by pumping the well at 1,400 m3<\/sup>\/d, 1,790 m3<\/sup>\/d and then 2,520 m3<\/sup>\/d for a total of 90 minutes with each step lasting 30 min. The time\u2011drawdown data and a semi\u2011log plot of the time\u2011drawdown data are presented here.<\/p>\n<\/div>\n

    \n

    \"\"<\/p>\n<\/div>\n

    \n

    Step\u2011drawdown test data for a production well. a) Time\u2011drawdown data for three steps. b) Plot of the log of time versus drawdown.<\/p><\/blockquote>\n<\/div>\n

    \n

    An Excel\u00ae data base of the time\u2011drawdown data is available on the web page for this book<\/a>\u2197.<\/p><\/blockquote>\n<\/div>\n

      \n
    1. Calculate the value of C<\/em> and B<\/em> for this system. Compute the well loss expected when pumping the well at 2,000 m3<\/sup>\/d.<\/li>\n
    2. Estimate the total drawdown after pumping the well for 30 min at 2,000 m3<\/sup>\/d.<\/li>\n
    3. Estimate transmissivity using the first 30 minutes of time\u2011drawdown data (step 1) (use the Cooper\u2011Jacob method).<\/li>\n<\/ol>\n
      \n

      Solution to Exercise\u00a05<\/a><\/p><\/blockquote>\n<\/div>\n

      \n

      Return to where text linked to Exercise\u00a05<\/a><\/p><\/blockquote>\n<\/div>\n<\/div>\n

      <\/div>\n<\/div>\n","protected":false},"author":8,"menu_order":78,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1815","chapter","type-chapter","status-publish","hentry"],"part":599,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapters\/1815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/users\/8"}],"version-history":[{"count":5,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapters\/1815\/revisions"}],"predecessor-version":[{"id":3711,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapters\/1815\/revisions\/3711"}],"part":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/parts\/599"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapters\/1815\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/media?parent=1815"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/chapter-type?post=1815"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/contributor?post=1815"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/license?post=1815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}